[Zope] Formatting numbers with commas

All, I'm working on my first zope project. This seems like something simple to do but I could not find the answers. I want a numeric value with commas for readability. For example, I want to display 1234567.89 as 1,234,567.89 Is there a format mask for this? I tried <dtml-var totAmt fmt="dollars-and-cents"> but this only put the '$' at the beginning. Is there a suitable 'C format string' for this? I have the zope bible but it did not have what I was looking for. Thanks. Mike